All of the following statements about evolution are true EXCEPT a. Evolution occurs more rapidly at some times than others.
b. Evolution is directed by changes in the environment.
c. Evolution occurs on the level of single organisms along with populations.
d. Evolution is not always from the simple to the complex but may act in such a way that complex forms give rise to simpler ones.

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.